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Boutonniere deformity, also called buttonhole deformity, can happen due to rheumatoid arthritis. The middle finger joint will bend toward the palm while the outer finger joint may bend opposite the palm. It may be the result of chronic inflammation of the finger's middle joint. Treatment may include splinting to keep the middle joint extended.
The inflammation may also spread to the tendons, which are the connective tissues that link muscles and bones. This can result in tears (ruptures) in the tendons. Rheumatoid arthritis of the hand is most common in the wrist and finger knuckles (the metacarpophalangeal or MP joints). Stiffness, swelling, loss of motion, and pain are symptoms common to both osteoarthritis and rheumatoid arthritis in the hands.